Question

This is a question from a redox lab we did. We need to write balanced equations for reactions that we observed.

Calcium and Hydrochloric acid

- we observed fizzing/ bubbling

Magnesium and Hydrochloric acid

-we observed fizzing/bubbling

Zinc and Hydrochloric acid

-we observed fizzing/bubbling

Iron and Hydrochloric acid

- we observed a color change, yellow/green

Calcium and water

-we observed fizzing/ bubbling

Answer 1

1. Ca_(s) + 2HCl_(conc.) CaCl_2(s) + H_2(g)

Fizzing/bubbling occured due to evolution of Hydrogen gas.

2. Mg_(s) + 2HCl_(conc.) MgCl_2(s) + H_2(g)

Fizzing/bubbling occured due to evolution of Hydrogen gas.

3. Zn_(s) + 2HCl_(conc.) ZnCl_2(s) + H_2(g)

Fizzing/bubbling occured due to evolution of Hydrogen gas.

4. Fe_(s) + 2 HCl_(conc.) FeCl_2(s) + H_2(g)

and

   2 Fe_(s) + 6 HCl_(conc.) 2 FeCl_3(s) + 3 H_2(g)

Yellow/green color solid forms due to formation of a mixture of FeCl₂ and FeCl₃ as shown in above two reactions.

5. Ca_(s) + 2 H₂O_(l) Ca(OH)_2(s) + H_2(g)

Fizzing/bubbling occured due to evolution of Hydrogen gas.